A sheep was grazing with a flock of sheep. The sheep's owner knew about it, but he did not tell him anything until he had done some harm.
One day, a hungry wolf arrived where the flock was grazing. The wolf set up a small ambush to attack the flock. There he saw that there was also a sheep in the flock. The wolf said to the sheep, "Hey brother! You are not like these sheep, you are a carnivore like me. Come on, let's catch one of these sheep and eat both of them."
The sheep was pleased with the wolf's words and agreed to accompany him. But the moment the dog of the flock and the mare of the sheep came forward, they understood the plan of the wolf and the sheep. Together, they first attacked the sheep and drove it away. Then they killed the wolf too.
Moral: If you are someone's ally, be loyal. Harming your own community by joining forces with enemies is the cause of your own destruction. Outsiders will only use you for their own benefit.